a proper stteppe faction aar is yet to be written, the description of the terrible winters the hearding of catle the gathering of the clans to avenge an insult from the horrible horrible stinky people from the sea shore who live behinde the stone walls

a proper aar would be a mix beteween the life of gengis khan (remember the abduction of the wife the expel and all of that) and a western with the hearding of catle around long distances and the mighty cavalry attacks/charges

the suffering and the hardship of the caracters make for a proper interesting story (add in a bad birth with the children being born dead as an omen for bad things and make a poem about the strenght of men to bend the wheel of fortune to it´s own wishes )

i mean seriusly with a bit of research you can make an historical aar that represents the strugle and magnificence of the steppe people

or if you want another aproach but still with a nomad faction make an aar based on the arabians/africans from the desert